package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 *
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //校验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            //如果不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }

        //符合生成验证码
        String code = RandomUtil.randomNumbers(6);
        //保存验证码到session
        //session.setAttribute("code",code);
        //保存验证码到redis
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //发送验证码
        log.debug("发送短信验证码成功，验证码：{}", code);
        //返回ok
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            //如果不符合，返回错误信息
            return Result.fail("手机号格式错误");
        }
        //校验验证码
        //从session中取出验证码，与传来的参数比对
//        Object cacheCode = session.getAttribute("code");
//        String code = loginForm.getCode();
        //从redis中获取
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        String code = loginForm.getCode();
        if (cacheCode==null || !cacheCode.toString().equals(code)){
            //不一致，报错
            return Result.fail("验证码错误");
        }

        //一致，根据手机号查询用户
        User user = query().eq("phone", phone).one();

        //判断用户是否存在
        if (user==null){
            //不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }

        //保存用户信息到session
        //session.setAttribute("user", BeanUtil.copyProperties(user, UserDTO.class));//将user多余信息去掉换成dto
        //保存用户信息到redis
        //生成随机token作为登录令牌
        String token = UUID.randomUUID().toString(true);
        //将user对象转为hashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
       // Map<String, Object> userMap = BeanUtil.beanToMap(userDTO);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO,new HashMap<>(),
                CopyOptions.create().setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName,fieldValue) -> fieldValue.toString()));
        //存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey,userMap);//报错java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.String
        //设置token有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        //返回token
        return Result.ok(token);
    }

    @Override
    public Result sign() {
        // 张三:2022/？ 1111001010101001100101....01 31bit
        //获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY+userId+keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //第一天对应offset是0，第二天是1
        //写入redis，setbit key offset 1 往bitmap存,bitmap是字符串操作
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    //连续签到天数：从最后一次签到开始向前统计，直到遇到第一次未签为止，计算总的签到次数，就是连续签到天数
    @Override
    public Result SignCount() {
        // 张三:2022/？ 1111001010101001100101....01 31bit
        //获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //获取日期
        LocalDateTime now = LocalDateTime.now();
        //拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY+userId+keySuffix;
        //获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //获取本月截止今天为止的所有签到记录，返回的是一个十进制数字,今天是几号就查几位，bitfield key get u10 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(
                key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0));

        if (result==null||result.isEmpty()){
            return Result.ok(0);
        }
        //获取结果集
        Long num = result.get(0);
        if (num==null||num==0){
            return Result.ok(0);
        }
        //循环遍历
        int count = 0;
        while (true) {
            //如何从后向前遍历每个bit位
            //让这个数字与1做与运算，得到数字的最后一个bit位 //判断这个bit位是否为零
            if ((num & 1) == 0) {
                //如果为0，则未签到
                break;
            }else {
                //如果不为0，已签到，计数器+1
                count++;
            }
            //把数字右移一位，抛弃最后一位，继续下一位bit位
            num >>>=1; //无符号右移，并赋值

        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone) {
        //创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        //保存用户
        save(user);
        return user;
    }
}
